DoctorV8

Aren't both those terms synonymous?

DoctorV8

Your hopes are going unfulfilled.

OK.....

I hope I do sound rude when I tell you that you don't know **** about formulating a question. Was there one in there that I missed?

RedLS6

Not necessarily true.

Consider this example, in which the torque number is greater than the horsepower number, but peak horsepower occurs higher than 5252rpm.

Torque RPM Horsepower
650 ... 3000 ... 371
650 ... 3500 ... 433
625 ... 4000 ... 476
600 ... 4500 ... 514
575 ... 5000 ... 547
540 ... 5500 ... 565
505 ... 6000 ... 577
465 ... 6500 ... 575
400 ... 7000 ... 533

It all has to do with the rates at which torque falls off, in the vicinity around 5252 rpm.

DoctorV8

Correct, but as I stated before, the numbers are close for conservatively tuned stock motors like a typical Gen II-V small block. The "peak" hp is actually a plateau in your example, not just a single point. We are talking about subtle differences here.

DoctorV8

That is true, and it also has to do with the type of dyno and how HP is calculated.

zeshawn

NO, there was no question for you, you've been arguing about pre 7th grade algebra for an hour, if that's pre 7th grade then you need to go back.

You now have two graphs that prove you wrong and you don't want to admit that you were wrong? Trying to go around what you just said by saying but the numbers are "usually" close on stock tuned motors when the whole argument has nothing to do with those leaked numbers, everyone here are SIMPLY trying to prove to you that it IS possible mathematically.

Accept it and move on.

zeshawn

no nothing has to do with any dyno here, any dyno will simply measure torque output at a certain RPM, take both those values and generate a HP figure.

racerns

The HP peak "plateau" is still starting well after 5252 rpm. I guess to me, that engine's HP peak is not before 5252 as you were stating it has to be for an NA motor.

DoctorV8

LOL....which is it ze?

I agree that within a small window, if torque falls off slower than RPM's rise, you can have relatively close HP and TQ numbers. racerns example is a good one. the equation I posted way back in the beginning still applies. Your graph using a modded FI motor with meth injection I addressed in an earlier post, if you care to waste your time reviewing it.

To quote a wise man from this forum whom I still have great respect for, have a day!

DoctorV8

You make a good point, but again, its a couple of hundred RPM difference. I'm certainly no engineer, but HP/tq peaks and RPM window differences aren't big in your typical conservatively cammed stock SBC. Maybe within the error bars for a dynojet, I dunno. See any highly tuned small displacement motor to make my point more emphatically.

Throw a set of heads/cam in that car, redyno to see the tq curve shift to a higher RPM, and watch the HP climb. That's my point. Sorry to hijack the original thread.

DoctorV8

using the very same 7th grade equation that you were questioning earlier? Or is there a different method you'd care to educate us on?

OnPoint

I wonder how the new mill's VVT impacts all this.

LT1xL82

racerns

Your right for a 350 but as I said my 396 LT4 had heads and cam and put down ~430rwhp/440rwtq.

By the way I have the same Vettes as you, a Cyber Gray ZR1 and Red 90' ZR-1.

jedblanks

Mathematically, yes. It was stated for illustrative purposes.

DoctorV8

You sir, have impeccable taste.

JoesC5

1964 Corvette had four engines to choose from.

250HP/350 lb-ft
300HP/360 lb-ft
365HP/350 lb-ft
375HP/350 lb-ft

All four engines had the HP curve and the torque curve intersect at 5252 RPM.

racerns

You do realize that HP is just a calculation based on RPM (and torque) and that torque is what is measured? Because of this the curves have to cross at 5252 rpm no mater what engine it is.

DoctorV8

As does every other Corvette engine. GM's internal policy to obey the laws of thermodynamics goes back to its inception.

JoesC5

yes I do, and I also realize that the RPM where the torque peaks and how fast it drops off is what matters.

in the four examples I gave, each successive engine has the torque peaking at a higher RPM, thus while the peak torque does not increase(except for the 300 HP engine), the horsepower does.